CONICAL VOLUME-DELAY FUNCTIONS
针对广泛使用的BPR流量-延误函数的固有缺陷，提出了一组“良好行为”函数应满足的条件，并据此定义了一类新的锥形流量-延误函数，证明其满足所有条件，可作为BPR函数的可行替代。
The widely used BPR volume-delay functions have some inherent drawbacks. A set of conditions is developed which a “well behaved” volume delay function should satisfy. This leads to the definition of a new class of functions named conical volume-delay functions , due to their geometrical interpretation as hyperbolic conical sections. It is shown that these functions satisfy all conditions set forth and, thus, constitute a viable alternative to the BPR type functions.